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2. Yes, once you buy the domain, log into your godaddy.com account, manage the (public) DNS and add your (root) and www (or whatever) ANAMES to DNS and point it to your public IP. Then you need to setup your firewall to allow the necessary ports (typically 80 and 443).

1. Could you please let me know. What is the process of purchasing domain? Which is the best vendor to purchase domain from?

- Create an account with a domain registrar, find out if your domain is available and then go through the purchasing steps to acquire it. I currently use GoDaddy for my domain registrar. If you search around, you'll find a few coupons that will give you a break on the price

﻿2. Once the purchase of domain can we link our company Public IP in our domain by defining firewall rules? Orelse there will be a web site tool kind of thing?

Will you be hosting your own website/web application on your own servers?

This is where External DNS comes in﻿. You can create/edit different DNS records [host, mx, txt, srv] and link them to single or multiple IP addresses behind which the websites/applications reside. This will need you to forward ports to the respective services wherever they reside intenally.

This is a bit of an oversimplification..but it's the gist of it.

3. Do we also have to purchase SSL certificate for HTTPS access? Which Cert vendor is good?

You'll need to purchase a 3rd party SSL cert for HTTPS access. You could technically use a self signed or self created cert, but depending on what you're doing, whether testing or production.

Obtaining a 3rd party SSL cert from a CA is easy as well. I use Godaddy as well with SSL certs. Haven't had any problems whatsoever.

You fill in your primary name, the alternative name, and you're pretty much good to go.

** if you're doing testing and don't want to purchase a SSL cert, you can actually obtain a free 1 year cert from StartSSL.com

Thank you for the valuable reply. Yes, we will be hosting web server on our own. Actually I am network administrator. Just curious to know how things work with web server. But, you have saved my time for testing. It sounds awesome that startssl.com is providing free certificates. At the moment we are building our infrastructure. Wanted to test with one example scenario. I have created 2 virtual machines and setup IIS web servers. Created firewall rules and logged in from outside the network using our public IP on two different ports. Problem is prompting is SSL Certificate error. For domain I think we have to purchase one ASAP. Will try one certificate from startssl.com and update you.